Free decision tools built from real data.
We turn government datasets, manufacturer specifications, and engineering guidance into practical answers for homeowners — what size to buy, when to plant, how long to run it.
Yard & garden
Frost Dates & Planting Planner
Enter your ZIP code for first/last frost dates, frost probability bands, growing-season length, and a personalized planting calendar — from 30 years of NOAA station data.
Lawn Watering Planner
How long should you water your lawn? Enter your ZIP, grass, soil, and sprinkler heads for minutes per zone, watering days, and a cycle-and-soak schedule.
Soil Report
What's under your ZIP code? Free lookup of USDA SSURGO soil-survey data — drainage class, septic suitability, water-table depth, plain-English verdicts. 7,223 ZIPs across 8 states.
Water
Pool Gallons Calculator
How many gallons is your pool? Pick the shape, enter dimensions, and get gallons, fill time and cost, plus chemical starter doses.
Sump Pump Size Calculator
What size sump pump do you need? Run the 60-second pit test and get the GPH and horsepower your basement actually needs.
Power & equipment
Generator Size Calculator
What size generator do you need? Check off your appliances and get the right size in kW — portable vs. standby guidance included.
Pressure Washer Size Calculator
What PSI pressure washer do you need? Pick your jobs — car, deck, driveway, siding — and get the right size plus nozzle guidance.
Snow Blower Size Calculator
What size snow blower do you need? Driveway size, snowfall, and surface in — the right stage, width, and power source out.
Extension Cord Gauge Calculator
What gauge extension cord do you need? Enter amps and length for the safe AWG — with outdoor and GFCI safety guidance.
Home
How we build answers
Every White Harbor tool follows the same standards — because our whole pitch is that we did more work underneath the answer.
- Real data, shown. Each tool names its sources — NOAA climate normals, ENERGY STAR guidance, manufacturer sizing charts — with links, so you can check our work.
- Assumptions disclosed. Where we use a rule of thumb, we label it as one. No hidden fudge factors.
- Runs in your browser. Your inputs never leave your device. No signup, no cookies, no personal data collected.
- Uncertainty surfaced. When the honest answer is a range, we show the range — not a false-precision single number.